I know MSD have a tach driver, and I *think* the F.R. one operates the same... They aplify the small pulses on the coil + wire that are generated each time the coils are fired. The ECU on the BA's controls everything, theres no ignitor modules etc for the coils. We are working on a tach adapter as well as a shift light / beep module for the BA's The shift light / beep module will be available very soon, which will be a fully programmable shift light / beep and also has one additional adjustable output. These modules can be programmed by laptop, therefore if you want to change the trigger points, you can. The tach adapter we are designing, well im not going to tell you how it works in detail, but lets just say different to the MSD / F.R. ones, and possibly a lot more accurate as they are triggered by a sensor, not by detecting voltages.